For instance, those with master's degrees usually do not list their bachelor's degrees (only the highest earned degree), and a staff nurse would likely not list an MBA, but a nurse manager might choose to do so.
An unmanned aircraft system is an unmanned aircraft and the equipment necessary for the safe and efficient operation of that aircraft. An unmanned aircraft is a component of a UAS. It is defined by statute as an aircraft that is operated without the possibility of direct human intervention from within or on the aircraft (Public Law 112-95, Section 331(8)).
The U.S. military began experimenting with unmanned aircraft as early as World War I. By World War II, unmanned craft could be controlled by radio signals, usually from another aircraft. Vehicles that could return from a mission and be recovered appeared in the late 1950s.